Hello,
Just getting a 6.5l 1998. I was wanting it for towing. And sounds like I need a little work to keep it happy. Exhaust, Take the computer pack off the injection pump and mount it somewhere else with a heat dissapator on it. By the way, anyone think of mounting a small fan on the heatsink? So it always has air blowing across it? Like in your home computer? Do the Duramax fan trick to it also.

Anyway, does anybody know what the temps are after the turbo and into the intake? I know a air to air intercooler is an option. But I was thinking a air/ liquid intercooler. Much more efficient. BUT, will only keep it held to the 195 temp of the coolant. So, if the intake temp is less then that. Not a good idea.

I'm thinking Intake air temps would be in the range of 250 or more on the boost. They used Air/Liquid on some Lotus's and were making more power per liter then any thing.

A Air/Liquid also can be kept out of harms way. Those mounted under the front bumper are a little risky to me. I hit to much stuff in my trucks.

So, anybody got any temps of Intake charge air?

Thanks, Rick

I've hit 304 degrees. I have the stuff comng to do an air to air. Guys on here say they drop 150 degrees with them so I am hoping for the same.

Can be over 350deg at 15psi Boost - air-to-air charge air cooler can reduce that to ~20deg above ambient

Hmmm, got any idea what the Intake temps are when just hiway driving? No tow and not into the throttle?

160 - 180deg at 4-6psi, wintertime usually below 140deg - results vary by gearing, vehicle weight and driver habit.

Charge-air cooler isn't easily cost-effective in a light vehicle, non-towing application - most cost-to-result complaints have been from that segment.

Man, you guys are great...

So, If I hook up a Air/Liquid intercooler almost directly inline. Not much extra tubing I decrease my turbo lag. But might increase my temps by 30 degrees while not into the throttle. But, when I'm towing up a hill. My Intake air will stay at the 195 or 185 of the Radiator. Maybe up to 210.

Decisions, decisions...

I really don't want a intercooler hanging under my bumper. I know I'll smack it with something..

Anyone mounted one in front of the radiator?


By the way, truck is a
1998 6.5l 4x4 dual cab dually 4.10's.
Live in the Midwest close to St. Louis. 100 in summer and 0 in winter. Obviously, it goes a little farther then that both ways.

Loose a little efficiency during winter unless towing..

Not many folks run a charge air-to-water cooler off the engine coolant, because of the engine temps.

Requires an isolated system - ca\w, reservoir, electric pump, w\a, elect fan, and hoses.

Considerably more efficient at the Boost end, which may become less efficient where the heated water must be cooled by ambient air.

That's the reason air-to-air types are most popular - 20deg above ambient is fairly efficient, requiring only the heat exchanger and tubing.

Do a search here for plenty more info on both systems.

Ah, maybe for sports cars it's good. For long term towing with the turbo blowing, Not so good...

If you set up an alternate system.

If you use Engine coolant. I doubt you'd go over the 210.

Hmmm... Still thinking about it...

If I could just find a place to put the intercooler for a air to air. Out of harms way...

I origionally had a w-a setup. I ran a 4 or 5 gal resevoir with a seperate small alum radiator and a water pump off a ford lightning. It worked well.
I now have a small ( 12x18x3 w/ 2.5 inlet and outlet ) a-a ic. Alot less parts and no maint.
The hottest ive seen on my snapon 2500 loaded was 169 degrees at the iat. this was loaded with 7000 pound trailer on a 95 degree day at 14 lbs of boost.also showed 81mm3 of fuel.

I know. I didn't want one hanging in front either. But researching water to air and pricing then out. The only thing I am worried about hitting it is a rock from another car. I had that happen wth my 85 suburban with a 6 inch lift and 36 inch tires hit my condenser and put a hole in it. All I have there now is the stock plastic plate that has been there for 7 years and 110K miles and it doesn't look like anything has hit it. Now that I said that, first trip out with the intercooler and something will hit it. Good luck and I'll post my results when I am done. My Snap-on scanner was showing 304 degrees pretty regularly on the long hills pulling my trailer.

My underbumper IC has been there almost 5 years, despite what you read at some of the more inflamatory sites, a quality IC can survive to the rigors of duty there.

If I was a hard core off road rider, then I would "up-armor" it with a piece of plate I could remove at will, remember offroad mudding & crawling IC isn't necessary you aren't cranking that much on the turbo, A-A IC doesn't start to cool until you get +10mph or so airflow across it, so a armor plate wouldn't harm anything, remove the plate for the ride home.

Sort of been my experience also a dedicated off road truck is jacked way up so it doesn't bottom out, under bumper IC is above most protrusions, you may not need much of an armor plate to protect it.

I believe most will say to not put an IC in front of the rad due to overheating concerns. BUT, if you have the '97+ cooling mods (you do) and you arn't into extreem towing, I think a D-Max IC could work. At least that is what this guy did...http://bbs.off-road.com/ubbthreads/showflat.php/Cat/0/Number/1530567/page/0/fpart/1/vc/1
I realise it's a Cummins conversion and the heat isn't as big a worry, but I guess it WILL fit, and besides, that truck is KILLER cool!

Bill

Did you tow a lot with the Air to water? How large was the air to water? Which worked better? Or are they comprable? Where is your 12x18 mounted? If behind the grill do you have A/C?


Thanks

You guy's are great.

I origionally had a w-a setup. I ran a 4 or 5 gal resevoir with a seperate small alum radiator and a water pump off a ford lightning. It worked well.
I now have a small ( 12x18x3 w/ 2.5 inlet and outlet ) a-a ic. Alot less parts and no maint.
The hottest ive seen on my snapon 2500 loaded was 169 degrees at the iat. this was loaded with 7000 pound trailer on a 95 degree day at 14 lbs of boost.also showed 81mm3 of fuel.

There was a converted one selling on Ebay. But I can't find it now. Had Autometer gauges in it. Nice looking truck...


I believe most will say to not put an IC in front of the rad due to overheating concerns. BUT, if you have the '97+ cooling mods (you do) and you arn't into extreem towing, I think a D-Max IC could work. At least that is what this guy did...http://bbs.off-road.com/ubbthreads/showflat.php/Cat/0/Number/1530567/page/0/fpart/1/vc/1
I realise it's a Cummins conversion and the heat isn't as big a worry, but I guess it WILL fit, and besides, that truck is KILLER cool!

Bill